CN115517431A

CN115517431A - Sole and shoe

Info

Publication number: CN115517431A
Application number: CN202210708713.8A
Authority: CN
Inventors: 岩佐雄大郎; 桥场友和; 小泽圭太
Original assignee: Asics Corp
Current assignee: Asics Corp
Priority date: 2021-06-24
Filing date: 2022-06-22
Publication date: 2022-12-27
Also published as: US20220408878A1; EP4108116B1; EP4108116A1; JP2023003758A

Abstract

To provide a shoe sole comprising a cushioning material and a shoe comprising the shoe sole, which are both comfortable to wear and have cushioning properties. The sole includes a sole body including an insole and a cushioning material. The cushioning material is disposed adjacent to the inner bottom in a direction intersecting the thickness direction of the bottom body. The insole has a first facing surface facing the cushioning material and inclined with respect to the thickness direction, and the cushioning material includes: a buffer part having a three-dimensional shape formed by a wall whose outer shape is defined by a pair of parallel curved surfaces; and a plate-shaped fixing wall portion having a second facing surface facing the first facing surface. The fixing wall portion is inclined with respect to the thickness direction such that the second facing surface is parallel to the first facing surface. The first facing surface and the second facing surface are bonded via the adhesive layer, whereby the cushioning material is fixed with respect to the insole.

Description

Sole and shoe

Technical Field

The present invention relates to a shoe sole including a cushioning material for cushioning impact, and a shoe including the shoe sole.

Background

Conventionally, various cushioning materials for cushioning impact have been known, and these cushioning materials are used depending on the application. For example, in shoes, a cushioning material may be provided in the sole of the shoe in order to alleviate the impact generated when the shoe lands on the ground. As the cushioning material provided in the shoe sole, a resin or rubber member is generally used.

In recent years, shoes have been developed in which a sole is provided with a portion having a lattice structure or a mesh structure, thereby improving cushioning performance not only in terms of material but also in terms of structure. As a document disclosing a shoe including a sole provided with a portion having a lattice structure, for example, U.S. patent publication No. 2018/0049514 is disclosed.

On the other hand, japanese patent application laid-open No. 2017-527637 discloses: as a three-dimensional object manufactured by a three-dimensional lamination molding method, an object can be manufactured in which a thickness is given to the object based on a geometric surface structure such as a polyhedron having a cavity inside or a triple-period extremely-small curved surface, and the following is disclosed: by constructing the three-dimensional object with an elastic material, it is possible to adapt it for example to a shoe sole.

Disclosure of Invention

Here, in the case of assembling the cushioning material to the shoe sole, the cushioning material is generally fixed to the insole by an adhesive. In this case, the cushioning material must be firmly fixed so as not to peel off from the insole, but depending on the fixing structure, the cushioning performance of the cushioning material may not be sufficiently exhibited. Further, depending on the fixing structure, there is a possibility that a large difference in cushioning performance is generated between the portion where the cushioning material is provided and the remaining portion, and the wearing feeling is greatly reduced.

Accordingly, an object of the present invention is to provide a shoe sole including a cushioning material that achieves both a wearing sensation and cushioning performance, and a shoe including the shoe sole.

The present inventors have conceived that, when a cushioning material including a cushioning portion having a three-dimensional shape formed by a pair of parallel curved surfaces defining an outer shape is incorporated into a shoe sole, in order to secure a bonding area between the cushioning material and an insole, a fixing wall portion for bonding is provided in the cushioning material in addition to the cushioning portion. However, even when no treatment is performed, the rigidity of the fixing wall portion is higher than that of the surrounding area, and therefore, the wearing feeling may be reduced.

In this regard, the present inventors have conceived that the above-described problems can be solved by devising the structure and structure of the fixing wall portion in a predetermined elaboration, and have completed the present invention.

The shoe sole according to the first aspect of the present invention comprises: a bottom body provided with a ground contact surface, wherein a direction orthogonal to the ground contact surface is a thickness direction; and a buffer material assembled to the bottom body. The bottom body includes at least an insole, and the cushioning material is arranged to be aligned with the insole in a direction intersecting the thickness direction. The insole has a first facing surface that faces the cushioning material in a direction intersecting the thickness direction and is inclined with respect to the thickness direction, the cushioning material including: a buffer portion having a three-dimensional shape formed by a wall defining an outer shape by a pair of parallel curved surfaces; and a plate-shaped fixing wall portion provided on a side where the first facing surface is located when viewed from the buffer portion, and having a second facing surface facing the first facing surface. The fixing wall portion is provided so as to be inclined with respect to the thickness direction such that the second facing surface is parallel to the first facing surface. In the shoe sole according to the first aspect of the present invention, the cushioning material is fixed to the insole by bonding the first facing surface and the second facing surface via an adhesive layer.

The shoe sole according to the second aspect of the present invention comprises: a bottom body provided with a ground contact surface, wherein a direction orthogonal to the ground contact surface is set as a thickness direction; and a buffer material assembled to the bottom body. The bottom body includes at least an insole, and the cushioning material is arranged so as to be aligned with the insole in a direction intersecting the thickness direction. The insole has a first facing surface facing the cushioning material in a direction intersecting the thickness direction, and the cushioning material includes: a buffer portion having a three-dimensional shape formed by a wall defining an outer shape by a pair of parallel curved surfaces; and a plate-shaped fixing wall portion that is provided on a side where the first facing surface is located when viewed from the buffer portion, and that has a second facing surface that faces the first facing surface and is parallel to the first facing surface. The fixing wall portion is provided with a plurality of through holes that connect the internal space of the cushioning material and the space surrounding the cushioning portion to the second opposing surface. In the shoe sole according to the second aspect of the present invention, the cushioning material is fixed to the insole by bonding the first facing surface and the second facing surface via an adhesive layer.

The shoe based on the invention comprises: a sole according to the first or second aspect of the invention; and the upper is arranged above the sole.

These and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description, which is to be read in connection with the accompanying drawings.

Drawings

Fig. 1A is a perspective view of a three-dimensional structure portion of a cushioning material that follows the structure of the cushioning material included in the shoe sole of the embodiment.

Fig. 1B is a perspective view of a unit structure to which a thickness is given with reference to a unit structure of a schwarz P structure.

Fig. 2A is a front view of a three-dimensional structure portion of the cushioning material that follows the structure of the cushioning material included in the shoe sole of the embodiment.

Fig. 2B is a left side view of the three-dimensional structure portion of the cushioning material that follows the structure of the cushioning material included in the shoe sole of the embodiment.

Fig. 2C is a plan view of a three-dimensional structure portion of the cushioning material that follows the structure of the cushioning material included in the sole of the embodiment.

Fig. 2D is a bottom view of the three-dimensional structure portion of the cushioning material that follows the structure of the cushioning material included in the sole of the embodiment.

Fig. 3A and 3B are cross-sectional views of three-dimensional structural portions of the cushioning material that follow the structure of the cushioning material included in the sole of the embodiment.

Fig. 4A is a perspective view of the cushion material of comparative example 1.

Fig. 4B is a graph showing the results of simulation of the cushioning performance of the cushioning material of comparative example 1.

Fig. 5A is a perspective view of the cushioning material of structural example 1.

Fig. 5B is a graph showing the results of a simulation of the cushioning performance of the cushioning material of structural example 1.

Fig. 6A is a perspective view of a cushioning material of structural example 2.

Fig. 6B is a front view of the cushion material of structural example 2.

Fig. 6C is a left side view of the cushion material of structural example 2.

Fig. 7A is a perspective view of a cushion material of structural example 3.

Fig. 7B is a front view of the cushion material of structural example 3.

Fig. 7C is a left side view of the cushioning material of structural example 3.

Fig. 8 is a perspective view of the shoe sole and the shoe of the embodiment.

Fig. 9 is a side view of the sole of the embodiment as viewed from the lateral side.

Fig. 10 is a side view of the embodiment of the sole as viewed from the inner foot side.

Fig. 11 is a schematic plan view showing the arrangement position of the cushioning material in the shoe sole of the embodiment.

Fig. 12 is a perspective view of a cushioning material included in the shoe sole of the embodiment.

Fig. 13 is an enlarged view of a main part of a cushioning material included in the shoe sole according to the embodiment.

Fig. 14A and 14B are partial sectional views of the sole according to the embodiment.

Fig. 15A is a perspective view showing a simulation model of a sole of comparative example 2.

Fig. 15B is a perspective view showing a simulation model of a shoe sole according to the embodiment.

Fig. 16 is a graph showing the results of simulation of the cushioning performance of the soles of comparative example 2 and example.

Fig. 17 is a perspective view of a cushioning material included in the shoe sole of the first modification.

Fig. 18 is a perspective view of a cushioning material included in the shoe sole of the second modification.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments described below, the same or common portions are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

< cushion material conforming to the structure of cushion material included in shoe sole of embodiment >

Fig. 1A is a perspective view of a three-dimensional structure portion of a cushioning material conforming to the structure of the cushioning material included in a shoe sole of the embodiment, and fig. 1B is a perspective view of a unit structure to which a thickness is given with reference to a unit structure of a schwarz P structure. Fig. 2A to 2D are a front view, a left side view, a plan view, and a bottom view of the three-dimensional structure portion of the cushioning material shown in fig. 1A, respectively, as viewed along the directions of arrows IIA to IID shown in fig. 1A. Further, FIG. 3A is a cross-sectional view taken along line IIIA-IIIA shown in FIG. 2B, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB shown in FIG. 2A. First, before describing the sole of the present embodiment and the shoe including the sole, the cushioning material 1 conforming to the structure of the cushioning material included in the sole will be described with reference to fig. 1A to 3B.

As shown in fig. 1A to 3B (except fig. 1B), the cushioning material 1 has a cushioning portion 10 that is a portion that exhibits a cushioning function. The cushioning portion 10 has a three-dimensional shape formed by a wall 11 whose outer shape is defined by a pair of parallel curved surfaces, and has a wall structure having a cavity geometry therein. The cushion portion 10 includes at least one or more three-dimensional structure portions 12 having a shape in an unloaded state as shown in the drawing.

As shown in fig. 1A, a unit space S occupied by the three-dimensional structure portion 12 is trapezoidal in shape, and is defined by a set of facing surfaces A1, A2 located in the X-axis direction shown in the drawing, a set of facing surfaces B1, B2 located in the Y-axis direction shown in the drawing, and a set of facing surfaces C1, C2 located in the Z-axis direction shown in the drawing. The cushioning portion 10 of the cushioning material 1 is intended to exert a cushioning function by receiving a load in the Z-axis direction among the X-axis direction, the Y-axis direction, and the Z-axis direction.

The pair of facing surfaces A1, A2 located in the X-axis direction have the same size and the same shape in plan view, and each is a trapezoid in which the length LT of one side, i.e., the upper side, of the pair of sides extending in the Y-axis direction is shorter than the length LB of the other side, i.e., the lower side. The facing surfaces B1 and B2 in the Y-axis direction have the same size and the same shape in plan view, and are rectangular. The facing surfaces C1 and C2 of one pair positioned in the Z-axis direction are rectangular in plan view, but the length LT of one pair of sides extending in the Y-axis direction of one surface C1 is shorter than the length LB of one pair of sides extending in the Y-axis direction of the other surface C2.

Thus, the unit space S includes a trapezoidal space in which a pair of facing surfaces B1 and B2 located in the Y-axis direction are inclined. Accordingly, the three-dimensional structure portion 12 has an end portion on the side where the facing surfaces B1 and B2 are located as an inclined end portion.

The ratio of the length LT to the length LB of the side is not particularly limited, but preferably satisfies the condition of LT/LB ≦ 4.0.

The openings 13 located at the end portions of the three-dimensional structure portion 12 are located on the respective surfaces A1, A2, B1, B2, C1, C2 included in the three sets of facing surfaces. In fig. 1A to 3B (except fig. 1B), end faces of the three-dimensional structure portion 12 in the X-axis direction, the Y-axis direction, and the Z-axis direction are indicated with a dark color so as to be distinguished from other outer faces of the three-dimensional structure portion 12, in order to understand the shape of the three-dimensional structure portion 12.

The three-dimensional structure portion 12 of the cushion material 1 is formed by changing the shape of the unit structure U 'of the cushion material 1' serving as a reference shown in fig. 1B, and has a shape shown in fig. 1A to 3B (except fig. 1B) in a no-load state.

As shown in fig. 1B, the unit structure U 'of the cushion material 1' serving as a reference is formed by giving a thickness to a unit structure of a schwarz P structure, which is one of mathematically defined curved surfaces having a very small triple cycle. The minimum curved surface is defined as the one having the smallest area in a curved surface having a given closed curve at the boundary.

The unit space S 'occupied by the unit structure U' is in a regular hexahedron shape (cubic shape), and is defined by a set of facing surfaces A1', A2' located in the X-axis direction, a set of facing surfaces B1', B2' located in the Y-axis direction, and a set of facing surfaces C1', C2' located in the Z-axis direction. Each face A1', A2', B1', B2', C1', C2' included in the three sets of facing faces is a square in plan view.

The shape of the three-dimensional structure portion 12 of the cushioning material 1 in the unloaded state is obtained by changing the shape of the regular hexahedral unit space S ' of the cushioning material 1' as a reference to the trapezoidal unit space S as described above, and changing the shape of the unit structure U ' so as to follow this. More specifically, the shape of the three-dimensional structure portion 12 in the unloaded state is obtained by changing the shape of the regular hexahedral unit space S ' of the reference cushioning material 1' to a trapezoidal space by inclining each of the surfaces included in one set of facing surfaces B1 and B2 located in the Y axis direction out of the three sets of facing surfaces, and changing the shape of the unit structure U ' so as to follow this.

Here, as described above, the cushion portion 10 of the cushion material 1 may include at least one or more three-dimensional structure portions 12 having a shape in an unloaded state as shown in the drawings.

That is, in the case where the cushion unit 10 includes only one type of unit structure, the number of the three-dimensional structure portions 12 may be only one or a plurality as long as the one type of unit structure includes the three-dimensional structure portion 12 as shown in the drawing. When the number of the three-dimensional structures 12 is plural, the plural three-dimensional structures 12 may be repeatedly arranged along at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction.

In the case where the cushioning material 1 includes a plurality of types of unit structures, as long as one of the unit structures includes the three-dimensional structure portion 12 as shown in the drawing, the number of the three-dimensional structure portion 12 in this case may be only one or a plurality. When the number of the three-dimensional structure portions 12 is plural, the plural three-dimensional structure portions 12 may be repeatedly arranged along at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction with or without sandwiching another kind of unit structure therebetween.

The cushioning material 1 may further include a support portion 20 (see fig. 12 and the like) or a fixing wall portion 30 (see fig. 12 and the like), a reinforcing portion 40', a reinforcing portion 40 "(see fig. 13 and the like), an extending portion 50 (see fig. 18), and the like, which will be described later, in addition to the cushioning portion 10. In this case, these portions are provided adjacent to the cushioning portion 10.

The method for producing the cushioning material 1 is not particularly limited, and the cushioning material 1 can be produced by, for example, shaping using a three-dimensional lamination shaping apparatus.

The material of the cushion material 1 may be basically any material as long as it is a material having a high elastic force, but a resin material or a rubber material is preferable. More specifically, when the cushion material 1 is made of resin, for example, polyolefin resin, ethylene Vinyl Acetate (EVA), polyamide Thermoplastic Elastomer (Thermoplastic Polyamide, TPA), thermoplastic Polyamide Elastomer (TPAE)), thermoplastic Polyurethane (TPU), or Polyester Thermoplastic Elastomer (TPEE) can be used. On the other hand, when the cushion material 1 is made of rubber, for example, butadiene rubber is used.

The cushion material 1 may also contain a polymer composition. In this case, examples of the polymer contained in the polymer composition include olefin polymers such as olefin elastomers and olefin resins. Examples of the olefin-based polymer include Polyethylene (e.g., linear Low Density Polyethylene (LLDPE), high Density Polyethylene (HDPE), etc.), polypropylene, ethylene-propylene copolymer, propylene-1-hexene copolymer, propylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer, 1-butene-1-hexene copolymer, 1-butene-4-methyl-pentene, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methyl methacrylate copolymer, propylene-ethyl methacrylate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-ethyl acetate copolymer (EVA), and the like.

The polymer may be an amide polymer such as an amide elastomer or an amide resin. Examples of the amide polymer include polyamide 6, polyamide 11, polyamide 12, polyamide 66, and polyamide 610.

The polymer may be an ester-based polymer such as an ester-based elastomer or an ester-based resin. Examples of the ester polymer include polyethylene terephthalate and polybutylene terephthalate.

The polymer may be a urethane polymer such as a urethane elastomer or a urethane resin. Examples of the urethane polymer include polyester polyurethane and polyether polyurethane.

The polymer may be a styrene polymer such as a styrene elastomer or a styrene resin. Examples of the Styrene-based elastomer include Styrene-Ethylene-Butylene copolymer (Styrene-Ethylene-Butylene, SEB), styrene-Butadiene-Styrene copolymer (Styrene-Butadiene-Styrene, SBS), hydrogenated product of SBS (Styrene-Ethylene-Butylene-Styrene copolymer (SEBs)), styrene-Isoprene-Styrene copolymer (Styrene-Isoprene-Styrene, SIS), hydrogenated product of SIS (Styrene-Ethylene-Propylene-Styrene copolymer (Styrene-Ethylene-Propylene-Styrene, SEPS)), styrene-Isobutylene-Styrene copolymer (Styrene-Butadiene-Styrene, SIBS), styrene-Butadiene-Styrene-Butadiene (Styrene-Butadiene-Styrene, sbstyrene-Styrene, SBS-Styrene, sbstyrene-Styrene, SBS, styrene-Styrene, SBS, and the like. Examples of the Styrene resin include polystyrene, acrylonitrile Styrene resin (AS), and Acrylonitrile Butadiene Styrene resin (ABS).

The polymer may be, for example, a propylene polymer such as polymethyl methacrylate, a urethane propylene polymer, a polyester propylene polymer, a polyether propylene polymer, a polycarbonate propylene polymer, an epoxy propylene polymer, a conjugated diene polymer, a propylene polymer and a hydrogenated product thereof, a urethane methacrylic polymer, a polyester methacrylic polymer, a polyether methacrylic polymer, a polycarbonate methacrylic polymer, an epoxy methacrylic polymer, a conjugated diene polymer, a hydrogenated product thereof, a polyvinyl chloride resin, a silicone elastomer, a Butadiene Rubber (Butadiene Rubber, BR), an Isoprene Rubber (Isoprene Rubber, IR), a Chloroprene Rubber (CR), a Natural Rubber (Natural Rubber, NR), a Styrene Butadiene Rubber (Styrene Butadiene Rubber, SBR), a Nitrile Rubber (Nitrile Butadiene Rubber, NBR), a Butyl Rubber (IIR), or the like.

The cushion material 1 described above is excellent in cushion performance. Hereinafter, this point will be described in detail based on the result of the first verification test performed by the present inventors.

Fig. 4A is a perspective view of a cushion material of comparative example 1, and fig. 4B is a graph showing a result of simulation of the cushion performance of the cushion material of comparative example 1. Fig. 5A is a perspective view of the cushion material of structural example 1, and fig. 5B is a graph showing a result of simulation of the cushion performance of the cushion material of structural example 1.

In the first verification test, models of the cushioning materials of comparative example 1 and structural example 1 were specifically designed, and assuming that an external force was applied to these models along a predetermined direction, behaviors at that time were analyzed individually by simulation. More specifically, so-called load-displacement curves are obtained with respect to these models, respectively.

Here, as shown in fig. 4A, the cushion material 1X of comparative example 1 has a three-dimensional structure portion 12X having a shape in the unloaded state obtained by changing the shape of the unit space S ' of the regular hexahedron shape of the cushion material 1' serving as a reference to a rectangular parallelepiped unit space by extending only in the Z-axis direction, and the unit structure U ' is changed in shape so as to follow this. On the other hand, the cushion material 1A of the structural example 1 has the three-dimensional structural portion 12A having a shape in the unloaded state obtained by changing the shape of the regular hexahedral unit space S ' of the cushion material 1' as a reference to the trapezoidal space, and changing the shape of the unit structure U ' so as to follow the trapezoidal space, similarly to the above-described cushion material 1.

More specifically, the cushioning material 1X of comparative example 1 is a three-dimensional structure 12X as a unit structure, in which the dimensions in the X-axis direction and the Y-axis direction are 10mm, respectively, and the dimension in the Z-axis direction of the three-dimensional structure 12X is 20 mm. The thickness of the wall 11 of the three-dimensional structure 12X was set to 1.52mm, and a urethane-based propylene polymer having an elastic modulus of 7.1MPa was assumed as the material.

On the other hand, the cushion material 1A of the structural example 1 is one in which the dimensions of the three-dimensional structure portion 12A as a unit structure in the X-axis direction and the Z-axis direction are 10mm and 20mm, respectively, and the length LT and the length LB shown in fig. 1A of the three-dimensional structure portion 12A are 10mm and 20mm, respectively. The thickness of the wall 11 of the three-dimensional structure portion 12A was set to 2.32mm, and a urethane-based propylene polymer having an elastic modulus of 7.1MPa was assumed as the material.

The directions of the external force applied to the

cushioning materials

1X and 1A in comparative example 1 and configuration example 1 are a vertical direction (i.e., Z-axis direction) and an oblique direction (i.e., a direction orthogonal to the X-axis direction and intersecting both the Y-axis direction and the Z-axis direction). Fig. 4A and 5A show an exemplary state in which four three-

dimensional structure portions

12X and 12A are arranged along the X-axis direction.

As shown in fig. 4B, the cushioning material 1X of comparative example 1 has a property that the load is rapidly decreased at a time point when the compressive displacement reaches a certain value in both cases where an external force is applied in the vertical direction and where an external force is applied in the oblique direction. This property is not necessarily preferable in consideration of general use as a cushioning material, and for example, in a case where the cushioning material 1X is applied to a shoe sole, a wearing feeling may be impaired.

On the other hand, as shown in fig. 5B, the cushioning material 1A of the structural example 1 has a property that the load gradually increases in both the case where an external force is applied in the vertical direction and the case where an external force is applied in the oblique direction. Such properties are desirable in consideration of general use as a cushioning material, and since the cushioning material is displaced stably in the course of an increase in load applied from the outside, for example, if the cushioning material 1A is applied to a shoe sole, a shoe having an excellent wearing feeling can be produced.

Therefore, by using the cushion material 1, a cushion material having excellent cushioning properties can be produced which can be used for various purposes. In the case where the three-dimensional structural portions are arranged in a row like the cushioning material 1A of the above-described structural example 1, it is preferable that the directions (i.e., the Z-axis direction) in which the cushioning function is intended to be exhibited in each of the plurality of three-dimensional structural portions are arranged substantially parallel to each other.

Fig. 6A is a perspective view of the cushion material of configuration example 2, and fig. 6B and 6C are a front view and a left side view of the cushion material shown in fig. 6A, respectively, as viewed along the directions of arrow VIB and arrow VIC shown in fig. 6A. Next, the cushion material 1B of the structural example 2 will be described with reference to fig. 6A to 6C.

As shown in fig. 6A to 6C, the cushioning material 1B of the structural example 2 includes two types of three-dimensional

structural portions

12A, 12B as unit structures. Both of the three-

dimensional structure portions

12A and 12B are similar to the cushion material 1, and are formed in such a manner that, when the unit space S ' of the regular hexahedral shape of the cushion material 1' serving as a reference is changed to the trapezoidal space, the unit structure U ' is changed in shape so as to follow this, but the trapezoidal shape of the three-dimensional structure portion 12B is inverted from the shape of the three-dimensional structure portion 12A in the Z-axis direction. The three-dimensional structure portion 12A is the same as the three-dimensional structure portion 12A included in the cushioning material 1A of the above-described configuration example 1.

Here, in the cushion material 1B of configuration example 2, four three-

dimensional structure portions

12A and 12B are arranged along the X-axis direction to form a row, and the three-

dimensional structure portions

12A and 12B arranged in two rows are arranged in a row in the Y-axis direction. In the case of such an arrangement, the cushion material 1B has a substantially parallelogram shape when viewed in the X-axis direction (see fig. 6B).

In the cushion material 1B having such a configuration, similarly to the above-described cushion material 1, a cushion material having excellent cushion performance can be obtained which can be used for various applications. In the case where the three-dimensional structural parts are arranged in a matrix in this manner, it is preferable that the directions in which the respective three-dimensional structural parts attempt to exhibit the cushioning function (i.e., the Z-axis direction) are arranged substantially parallel to each other.

Fig. 7A is a perspective view of the cushion material of structural example 3, and fig. 7B and 7C are a front view and a left side view of the cushion material shown in fig. 7A, respectively, as viewed along the direction of arrow VIIB and arrow VIIC shown in fig. 7A. Hereinafter, the cushion material 1C of structural example 3 will be described with reference to fig. 7A to 7C.

As shown in fig. 7A to 7C, the cushion material 1C of the structural example 3 includes two types of three-dimensional

structural portions

12A, 12M as unit structures. Like the cushion material 1, the three-dimensional structure portion 12A is a shape obtained by changing the shape of the regular hexahedral unit space S ' of the cushion material 1' serving as a reference to a trapezoidal space so as to follow the trapezoidal space, and the shape of the unit structure U ' in the unloaded state is a shape obtained by changing the shape of the flat rectangular parallelepiped unit space S ' of the cushion material 1' serving as a reference to a flat rectangular parallelepiped unit space, unlike the cushion material 1, the remaining three-dimensional structure portion 12M. The three-dimensional structure portion 12A is the same as the three-dimensional structure portion 12A included in the cushioning material 1A of the above-described configuration example 1.

Here, in the cushion material 1C of configuration example 3, four three-

dimensional structure portions

12A and 12M are arranged in the X-axis direction to form a column, and one column including the three-dimensional structure portion 12M is arranged between two columns including the three-dimensional structure portion 12A, whereby the three-

dimensional structure portions

12A and 12M arranged in three columns are arranged in a row in the Y-axis direction. In the case of such an arrangement, the cushion material 1C has a substantially trapezoidal outer shape as a whole when viewed in the X-axis direction (see fig. 7B).

In the cushion material 1C having such a configuration, similarly to the above-described cushion material 1, a cushion material having excellent cushion performance can be obtained which can be used for various applications. In the case where the three-dimensional structural portions are arranged in a matrix as described above, it is preferable that the directions in which the cushioning function is intended to be exhibited (i.e., the Z-axis direction) of the plurality of three-dimensional structural portions are arranged substantially parallel to each other.

In addition, the above description has been made by exemplifying the case where the shapes of the three-dimensional structure portion 12 and the three-dimensional structure portion 12A in the no-load state are obtained by changing the shape of the regular hexahedral unit space S ' of the cushion material 1' serving as a reference to the trapezoidal space by inclining each of the surfaces included in the one set of facing surfaces B1 and B2 located in the Y axis direction out of the three sets of facing surfaces, and the unit structure U ' is changed in shape so as to follow the trapezoidal space, but it may be appropriately changed.

For example, the shape of the three-dimensional structure portion in the unloaded state may be a shape obtained by changing the shape of the unit space S 'in the regular hexahedral shape of the cushion material 1' serving as a reference to a trapezoidal space by inclining each of the faces included in not only the one set of facing surfaces B1 and B2 located in the Y-axis direction but also the one set of facing surfaces A1 and A2 located in the X-axis direction, and changing the shape of the unit structure U 'so as to follow this, and may be a shape obtained by changing the shape of the unit structure U' so as to follow this when changing the shape to a substantially trapezoidal space by slightly inclining or bending the one set of facing surfaces C1 and C2 located in the Z-axis direction.

In the case of the three-dimensional structure portion having any of the above-described shapes, a cushion material having excellent cushion performance can be produced which can be used for various applications, similarly to the above-described cushion material 1.

Sole and shoe of embodiment

Fig. 8 is a perspective view of the shoe sole and the shoe of the embodiment. Fig. 9 and 10 are side views of the sole shown in fig. 8, as viewed from the lateral side and the medial side, respectively. Fig. 11 is a schematic plan view showing the arrangement position of the cushioning material in the shoe sole shown in fig. 8. First, a schematic structure of the shoe sole 110 and the shoe 100 including the shoe sole according to the present embodiment will be described with reference to fig. 8 to 11.

As shown in fig. 8, the shoe 100 includes a sole 110 and an upper 120. The sole 110 is a member that covers the ball of the foot, and has a substantially flat shape. Upper 120 has an overall shape that covers at least a portion of the inserted instep side, and is positioned above sole 110.

The upper 120 has an upper body 121, a Tongue (shoye Tongue) 122, and a lace (shoelace) 123. Both tongue 122 and lace 123 are secured or attached to upper body 121.

An upper opening portion that exposes an upper portion of the ankle and a portion of the instep is provided in the upper portion of the upper body 121. On the other hand, a lower opening covered with the sole 110 is provided on the lower portion of the upper body 121, for example, and a bottom portion is formed by sewing a lower end of the upper body 121.

The tongue 122 is fixed to the upper body 121 by sewing, welding, or gluing, or a combination thereof, so as to cover a portion of the instep, which is provided in the upper opening portion of the upper body 121, that exposes a portion of the instep. As the upper body 121 and the tongue 122, for example, woven fabric, knitted fabric, nonwoven fabric, synthetic leather, resin, or the like is used, and in shoes particularly requiring air permeability or lightweight property, a Double rib (Double Russell) warp knit fabric formed by knitting polyester yarn is used.

The lace 123 includes a band-shaped member that is inserted into a plurality of holes provided in the periphery of the upper opening and that pulls the peripheries of the upper openings provided in the upper body 121, which expose a part of the instep, against each other in the foot width direction. By fastening the lace 123 in a state where the foot is inserted into the upper body 121, the upper body 121 can be closely attached to the foot.

As shown in fig. 8 to 11, the shoe sole 110 includes an insole 111 and an outsole 112 as a sole body, and cushioning materials 1D1 to 1D3.

The insole 111 has an upper surface, a lower surface, and a side surface connecting the upper surface and the lower surface, and constitutes an upper portion of the sole 110. The upper surface of insole 111 is joined to upper 120.

The insole 111 preferably has appropriate strength and excellent cushioning properties, and from this viewpoint, the insole 111 may be made of, for example, a resin or rubber member, and is preferably a foamed material or a non-foamed material including, for example, a polyolefin resin, an ethylene-vinyl acetate copolymer (EVA), a polyamide thermoplastic elastomer (TPA, TPAE), a Thermoplastic Polyurethane (TPU), a polyester thermoplastic elastomer (TPEE), or the like.

Outsole 112 has an upper surface and a lower surface serving as ground contact surface 112a, and constitutes a lower portion side portion of sole 110. The outsole 112 is primarily engaged to the insole 111.

The outsole 112 is preferably excellent in wear resistance and grip performance, and from this viewpoint, for example, rubber is used as the outsole 112. Further, a tread pattern (tread pattern) may be provided to the lower surface of the outsole 112, that is, the ground contact surface 112a, from the viewpoint of improving grip.

The cushioning materials 1D1 to 1D3 are arranged in a direction intersecting the thickness direction (Z-axis direction) of the bottom body including the insole 111 and the outsole 112, and are aligned with the insole 111, more specifically, are arranged in notches provided at predetermined positions of the insole 111. Thus, the cushioning materials 1D1 to 1D3 are sandwiched by the inner bottom 111 and the outer bottom 112 in the thickness direction of the bottom body. As described later, the cushioning materials 1D1 to 1D3 are joined to the insole 111 and the outsole 112 with an adhesive, and a part thereof is provided so as to be exposed on the circumferential surface of the sole 110.

As shown in fig. 9 to 11, the sole 110 is divided into a forefoot portion R1, a midfoot portion R2, and a rearfoot portion R3 in a plan view along a front-rear direction (a left-right direction in fig. 9 and 10, and a top-bottom direction in fig. 11) which is a direction matching a foot length direction of a foot of a wearer, the forefoot portion R1 supporting a toe portion and a tread portion of the foot of the wearer, the midfoot portion R2 supporting an arch portion of the foot of the wearer, and the rearfoot portion R3 supporting a heel portion of the foot of the wearer.

Here, when a position corresponding to 40% of the dimension in the front-rear direction of the sole 110 from the front end is defined as a first boundary position and a position corresponding to 80% of the dimension in the front-rear direction of the sole 110 from the front end is defined as a second boundary position with respect to the front end of the sole 110, the forefoot portion R1 corresponds to a portion included between the front end and the first boundary position along the front-rear direction, the midfoot portion R2 corresponds to a portion included between the first boundary position and the second boundary position along the front-rear direction, and the hindfoot portion R3 corresponds to a portion included between the second boundary position and the rear end of the sole along the front-rear direction.

As shown in fig. 11, in a plan view, the sole 110 is divided into a medial side portion (portion on the S1 side shown in the drawing) which is a medial side (i.e., a side close to the center) of the anatomical true position of the foot and a lateral side portion (portion on the S2 side shown in the drawing) which is an opposite side (i.e., a side away from the center) of the anatomical true position of the foot along a lateral direction (lateral direction in the drawing) which is a direction coincident with the foot width direction of the foot of the wearer.

As shown in fig. 8 to 11, the insole 111 extends in the front-rear direction from the front foot portion R1 to the rear foot portion R3 via the middle foot portion R2. The outsole 112 comprises: a portion disposed so as to straddle the front side positions in the front-rear direction of the forefoot portion R1 and the midfoot portion R2; and a portion disposed so as to straddle the rear position in the front-rear direction of the midfoot portion R2 and the hindfoot portion R3.

The cushion material 1D1 is provided along the outer-leg-side edge of the sole 110 so as to straddle the rear foot portion R3 and a portion of the midfoot portion R2 near the rear foot portion R3. The cushion material 1D2 is provided along the edge portion on the inner side of the sole 110 so as to straddle the rear foot portion R3 and the portion of the midfoot portion R2 near the rear foot portion R3. The cushion material 1D3 is provided along the edge on the outer leg side of the sole 110 so as to straddle the portion of the forefoot portion R1 near the midfoot portion R2 and the portion of the midfoot portion R2 near the forefoot portion R1.

Fig. 12 is a perspective view of the cushioning material included in the shoe sole shown in fig. 8, and fig. 13 is an enlarged view of a region XIII shown in fig. 12. Next, the detailed configurations of the cushion materials 1D1 to 1D3 will be described with reference to fig. 12 and 13.

As shown in fig. 12 and 13, each of the cushion materials 1D1 to 1D3 has a structure conforming to the above-described cushion material 1, and includes a cushion portion 10. The cushion section 10 has a three-dimensional shape formed by a wall 11 whose outer shape is defined by a pair of parallel curved surfaces, and includes a plurality of three-dimensional structural sections 12 as unit structures.

Each of the plurality of three-dimensional structure portions 12 has a shape obtained by changing the shape of the regular hexahedral unit space S ' (see fig. 1A) of the reference cushioning material 1' to a trapezoidal space, and changing the shape of the unit structure U ' so as to follow this. In each of the cushioning materials 1D1 to 1D3, the three-dimensional structure portions 12 are provided in a line in a direction along the edge of the shoe sole 110.

Here, each of the three-dimensional structure portions 12 is provided so that the direction in which the cushioning function is intended to be exerted (i.e., the Z-axis direction) is oriented in a direction orthogonal to the ground contact surface 112a of the outsole 112. With such a configuration, a load applied to the sole 110 from the sole and the ground surface during landing is absorbed by the cushioning portion 10 including the three-dimensional structure portion 12 being deformed by a large displacement amount, and the load applied to the sole from the sole 110 is reduced, thereby achieving high cushioning performance.

The cushioning materials 1D1 to 1D3 include the support portion 20 and the fixing wall portion 30, respectively, in addition to the cushioning portion 10. The support portion 20 and the fixing wall portion 30 are each formed in a plate shape, and are provided adjacent to the cushion portion 10 and integrally with the cushion portion 10. That is, the cushioning materials 1D1 to 1D3 include a single member formed by continuously connecting the cushioning portion 10, the support portion 20, and the fixing wall portion 30.

The support portion 20 is provided so as to be positioned in a direction (i.e., the Z-axis direction) in which each of the plurality of three-dimensional structure portions 12 in the cushioning materials 1D1 to 1D3 attempts to exhibit a cushioning function, and includes: an upper support portion 21 on which the upper 120 is located as viewed from the cushion portion 10; and a lower support portion 22 located on the side of the outsole 112 as viewed from the cushion portion 10. Thus, the cushioning portion 10 is sandwiched by the upper support portion 21 and the lower support portion 22.

The upper support portion 21 is provided with a plurality of through holes 21a. The through holes 21a communicate with the openings 13 of the three-dimensional structure portions 12 on the end surface on the upper support portion 21 side, respectively. On the other hand, the lower support portion 22 is also provided with a plurality of through holes 22a (see fig. 14A). The plurality of through holes 22a are communicated with the openings 13 of the end surfaces of the plurality of three-dimensional structure portions 12 on the side of the lower support portion 22, respectively.

The fixing wall portion 30 is provided so as to be positioned in a direction intersecting the direction in which each of the plurality of three-dimensional structure portions 12 of the cushioning materials 1D1 to 1D3 attempts to exhibit the cushioning function (i.e., the Z-axis direction), and more specifically, is provided in a portion of the cushioning materials 1D1 to 1D3 other than the portion exposed on the peripheral surface of the shoe sole 110. Thereby, the end surface of the peripheral surface of the cushioning portion 10 on the inner bottom 111 side is covered with the fixing wall portion 30.

The fixing wall portion 30 has the second facing surface 31 as the exposed surface. The fixing wall portion 30 is provided with a plurality of through holes 32. The through holes 32 include through holes that communicate with the openings 13 of the three-dimensional structure portions 12, respectively, that are located on the end surface on the fixing wall portion 30 side. The plurality of through-holes 32 also include a plurality of through-holes that do not correspond to the opening 13 and communicate with the space around the three-dimensional structure portion 12 (the through-holes 32 will be described later in detail).

The plurality of through-

holes

21a, 22a, and 32 provided in the upper support portion 21, the lower support portion 22, and the fixing wall portion 30 mainly serve as discharge ports for discharging uncured resin during the production of the cushioning materials 1D1 to 1D3 by the three-dimensional lamination method. That is, the through

holes

21a, 22a, and 32 communicate with the internal space of the three-dimensional structure portion 12 of the cushion portion 10 and the space surrounding the three-dimensional structure portion 12, so that the uncured resin can be discharged through the through

holes

21a, 22a, and 32 during manufacturing, and the cushion portion 10 having a desired shape can be shaped with high dimensional accuracy.

The upper support portion 21 and the fixing wall portion 30 are both fixed to the insole 111, and the lower support portion 22 is fixed to the outsole 112. That is, as described above, the cushioning portion 10 including the plurality of three-dimensional structures 12 has a geometrical wall structure, and thus, in the case of directly fixing it to the insole 111 or the outsole 112 by adhesion, deformation of the plurality of three-dimensional structures 12 is hindered, and desired cushioning performance cannot be obtained.

In this regard, by providing the upper support portion 21, the lower support portion 22, and the fixing wall portion 30 integrally with the cushioning portion 10, the cushioning materials 1D1 to 1D3 can be fixed to the insole 111 or the outsole 112 by adhesion while suppressing the deformation of the plurality of three-dimensional structure portions 12 from being hindered, and a desired cushioning performance can be obtained.

Fig. 14A and 14B are partial sectional views of the sole shown in fig. 8. Next, an assembly structure of the cushioning materials 1D1 to 1D3 in the shoe sole 110 according to the present embodiment will be described in detail with reference to fig. 14A and 14B. In fig. 14A and 14B, the assembling structure of the cushion material 1D1 is representatively illustrated, but the same applies to the assembling structure of the cushion material 1D2 and the cushion material 1D3.

Here, fig. 14A is a cross-sectional view of the shoe sole 110 including the above-described through-hole 32 (in the figure, this through-hole is particularly indicated by the reference numeral 32 (13)) that communicates with each of the openings 13 of the end surfaces of the plurality of three-dimensional structure portions 12 on the side of the fixing wall portion 30. On the other hand, fig. 14B is a cross-sectional view of the shoe sole 110 including the through-hole 32 (in the figure, the through-hole is simply indicated by a reference numeral 32) communicating with the space surrounding the three-dimensional structure portion 12.

As shown in fig. 14A and 14B, the cushioning material 1D1 is fixed to the insole 111 and the outsole 112 via the adhesive layer 113. Specifically, the upper support portion 21 of the cushioning material 1D1 is joined to the wall surface provided on the upper side of the cutout portion of the insole board 111 via the adhesive layer 113, and the fixing wall portion 30 is joined to the wall surface provided on the side of the cutout portion of the insole board 111 via the adhesive layer 113. The lower support portion 22 of the cushioning material 1D1 is joined to the upper surface of the outsole 112 via the adhesive layer 113.

More specifically, the wall surface on the upper side of the cutout portion of the insole 111 and the upper surface of the upper support portion 21 are both formed in a substantially planar shape, and the cushioning material 1D1 and the insole 111 are fixed to each other at this portion by bonding these surfaces with the adhesive layer 113. As shown in fig. 14A, the upper support portion 21 is provided with a plurality of through holes 21a as described above, and a part of the adhesive layer 113 enters the plurality of through holes 21a. Thereby, an increase of the bonding strength of this part is achieved by an increase of the bonding area and an anchoring effect.

The upper surface of the outsole 112 and the lower surface of the lower support portion 22 are both configured to be substantially planar, and the cushioning material 1D1 and the outsole 112 are fixed to each other at these portions by bonding these surfaces with the adhesive layer 113. As shown in fig. 14A, the lower support portion 22 is provided with a plurality of through holes 22a as described above, and a part of the adhesive layer 113 enters the plurality of through holes 22a. Thereby, an increase of the bonding strength of this part is achieved by an increase of the bonding area and an anchoring effect.

Further, the first facing surface 111a, which is a wall surface on the side of the cutout portion of the insole 111, and the second facing surface 31, which is an outer surface of the fixing wall portion 30, are both formed in substantially planar shapes, and are bonded to each other by the adhesive layer 113, whereby the cushioning material 1D1 and the insole 111 are fixed to each other at this portion. As shown in fig. 14A, the fixing wall 30 is provided with a plurality of through holes 32 (13) as described above, and a part of the adhesive layer 113 enters the plurality of through holes 32 (13). In addition, as shown in fig. 14B, as described above, the fixing wall portion 30 is further provided with a plurality of through holes 32, and a part of the adhesive layer 113 also enters the plurality of through holes 32 (13). Thereby, an increase of the bonding strength of this part is achieved by an increase of the bonding area and an anchoring effect.

As described above, the upper support portion 21, the lower support portion 22, and the fixing wall portion 30 are firmly fixed to the insole 111 and the outsole 112, and thus the cushion materials 1D1 to 1D3 can be effectively prevented from being peeled off from the insole 111 or the outsole 112. Further, by providing the plurality of through

holes

21a, 22a, and 32 in the upper support portion 21, the lower support portion 22, and the fixing wall portion 30, the joining strength of these portions can be increased, and a sole 110 having more excellent durability and a shoe 100 including this sole can be provided.

Here, as shown in fig. 14A and 14B, in the sole 110 of the present embodiment, the first opposing surface 111a, which is a wall surface on the side of the cutout portion of the insole 111, is provided so as to be inclined with respect to a direction perpendicular to the ground contact surface 112a (i.e., the thickness direction (Z-axis direction) of the sole body including the insole 111 and the outsole 112), more specifically, so as to be positioned so that the lower end thereof is positioned inside the sole body and the upper end thereof is positioned outside the sole body. On the other hand, the fixing wall portion 30 of the cushion material 1D1 is provided obliquely with respect to the thickness direction of the bottom body so that the second opposing surface 31 is parallel to the first opposing surface 111 a.

The fixing wall portion 30 inclined with respect to the thickness direction of the base body can be formed by arranging the plurality of three-dimensional structure portions 12 along the fixing wall portion 30 in a row so that each of the plurality of three-dimensional structure portions 12 included in the cushioning portion 10 includes the unit structure having the trapezoidal space as the unit space S as described above and the inclined end portions of the plurality of three-dimensional structure portions 12 are connected to the fixing wall portion 30.

In this way, the boundary between the insole 111 and the cushioning material 1D1 is inclined with respect to the thickness direction of the base body, and thus the rigidity in the thickness direction of the base body at this portion can be significantly reduced as compared with the case where the fixing wall portion 30 of the cushioning material 1D1 is provided so as to be parallel to the thickness direction of the base body.

Therefore, by configuring as above, it is possible to effectively suppress the rigidity at the boundary portion between the insole 111 and the cushioning material 1D1 from becoming higher than the surrounding, and it is possible to provide the shoe sole 110 having an excellent wearing feeling and the shoe 100 including the shoe sole.

Here, as shown in fig. 12 to 14B (particularly fig. 13, 14A, and 14B), in the shoe sole 110 of the present embodiment, the cushioning materials 1D1 to 1D3 include the reinforcing portion 40, the reinforcing portion 40', and the reinforcing portion 40 ″ in addition to the cushioning portion 10, the upper support portion 21, the lower support portion 22, and the fixing wall portion 30 described above.

More specifically, in the shoe sole 110, the lower support portion 22 has a protruding region that protrudes further outward than the end portion of the three-dimensional structure portion 12 on the lower support portion 22 side when viewed in the direction orthogonal to the ground contact surface 112a, that is, the thickness direction of the sole body (i.e., the Z direction shown in the figure). The protruding region is a portion having extremely low rigidity compared to the surrounding even when no treatment is performed, and is easily deformed by an external force applied thereto, and as a result, the portion may be damaged relatively early due to repeated use or the like.

In this regard, in the shoe sole 110 of the present embodiment, as shown in fig. 13 and 14A, in order to suppress deformation of the lower support portion 22 in the protruding region, the reinforcing portion 40 is provided so as to connect the portion closer to the end portion on the lower support portion 22 side of the three-dimensional structure portion 12 and the lower support portion 22 corresponding to the portion of the protruding region. The reinforcing portion 40 is formed by being fitted into a part of the space surrounding the three-dimensional structure portion 12, and by forming the reinforcing portion 40, the rigidity of this part is improved, and the lower support portion 22 of the portion corresponding to the protruding region can be suppressed from being excessively deformed.

Therefore, by adopting the above structure, the shoe sole 110 excellent in durability and the shoe 100 including the shoe sole can be manufactured. In addition, since the reinforcement part 40 also has a function of suppressing excessive compression deformation of the cushioning part 10, it is possible to provide the shoe sole 110 having excellent durability in this point and the shoe 100 including the shoe sole.

On the other hand, as shown in fig. 13 and 14A, the reinforcing portion 40' is provided to connect the upper support portion 21 and the portion closer to the end portion of the three-dimensional structure portion 12 on the upper support portion 21 side. The reinforcing portion 40' is also formed by being embedded in a part of the space surrounding the three-dimensional structure portion 12, similarly to the reinforcing portion 40. With such a configuration, excessive compression deformation of the cushioning portion 10 can be suppressed, and a shoe sole 110 having excellent durability and a shoe 100 including the shoe sole can be provided.

As shown in fig. 13 and 14B, the reinforcing portion 40 ″ is formed by fitting into a part of a space surrounding the three-dimensional structure portion 12 so as to connect the adjacent three-dimensional structure portions 12 to each other. With such a configuration, even when an external force is applied to the cushioning material 1D1 in a direction parallel to the ground contact surface 112a, excessive compression deformation of the cushioning material 1D1 can be suppressed, and a shoe sole 110 having excellent durability and a shoe 100 including the shoe sole can be provided.

Fig. 15A and 15B are perspective views showing simulation models of soles of comparative example 2 and example, respectively, and fig. 16 is a graph showing a result of simulation of the cushioning performance of the soles of comparative example 2 and example. Next, a second verification test, which is performed by the present inventors in order to confirm the effect obtained by inclining the fixing wall portion 30 with respect to the thickness direction of the bottom body, will be described in detail with reference to fig. 15A to 16.

In the second verification test, the simulation models of the soles of comparative example 2 and example were specifically created, respectively, and assuming that an external force was applied to these simulation models in a predetermined direction, behaviors at that time were analyzed individually by simulation. More specifically, these simulation models each obtain a so-called load-displacement curve of the boundary portion between the insole and the cushioning material.

Here, as shown in fig. 15A, in the simulation model 110Y of the sole of comparative example 2, the cushion material 1Y having the three-dimensional structure portion 12Y having a shape obtained by extending the regular hexahedral unit space S ' of the cushion material 1' serving as a reference in the Y axis direction and further slightly extending in the Z axis direction in the unloaded state is used, and when the shape is changed to the rectangular parallelepiped unit space, the unit structure U ' is changed in shape so as to follow this.

The cushion material 1Y includes an upper support portion 21 and a fixing wall portion 30, and the fixing wall portion 30 includes a vertical wall parallel to the thickness direction of the bottom body. Accordingly, the second facing surface 31 (see fig. 14A and 14B) provided on the fixing wall portion 30 includes a surface parallel to the thickness direction of the bottom body, and accordingly, the first facing surface 111a (see fig. 14A and 14B) serving as a wall surface on the side of the cutout portion of the insole 111 also includes a surface parallel to the thickness direction of the bottom body.

On the other hand, as shown in fig. 15B, in the simulation model 110A of the shoe sole of the embodiment, similarly to the above-described cushioning material 1, the three-dimensional structure portion 12E having a shape obtained by changing the shape of the regular hexahedral unit space S ' of the above-described cushioning material 1' as a reference to the trapezoidal space in the unloaded state is used, and the unit structure U ' is changed in shape so as to follow this.

The cushion material 1E includes an upper support portion 21 and a fixing wall portion 30, and the fixing wall portion 30 includes a wall inclined with respect to the thickness direction of the bottom body. Accordingly, the second facing surface 31 (see fig. 14A and 14B) provided on the fixing wall portion 30 includes a surface inclined with respect to the thickness direction of the bottom body, and accordingly, the first facing surface 111a (see fig. 14A and 14B) serving as a side wall surface of the cutout portion of the inner bottom 111 also includes a surface inclined with respect to the thickness direction of the bottom body.

Here, the simulation model 110Y of the sole of comparative example 2 and the simulation model 110A of the example were set to be the same except for the points described above. The direction of the external force applied by the simulation model 110Y and the simulation model 110A of the soles of comparative example 2 and the examples is the vertical direction (i.e., the Z-axis direction).

As shown in fig. 16, when the simulation model 110Y of the sole of comparative example 2 is compared with the simulation model 110A of the sole of the example, it can be seen that the rigidity of the boundary portion between the insole 111 and the cushioning material 1Y and the cushioning material 1E in the simulation model 110A of the sole of the example is lower than that of the simulation model 110Y of the sole of comparative example 2.

Therefore, based on the result of the second verification test, it can be said that: by adopting the sole 110 and the shoe 100 including the sole of the present embodiment, both the wearing feeling and the cushioning performance can be achieved.

< first modification >

Fig. 17 is a perspective view of a cushioning material included in the shoe sole of the first modification. Hereinafter, a cushioning material 1D1' included in a shoe sole according to a first modification of the present embodiment will be described with reference to fig. 17. The cushioning material 1D1' is disposed in the shoe sole 110 instead of the cushioning material 1D1 included in the shoe sole 110 of the present embodiment.

As shown in fig. 17, the cushioning material 1D1 'included in the shoe sole of the present modification differs from the cushioning material 1D1 included in the shoe sole 110 of the present embodiment only in that the reinforcement portion 40, the reinforcement portion 40', and the reinforcement portion 40 ″ are not provided. That is, the cushion material 1D1' includes only the cushion portion 10 including the plurality of three-dimensional structure portions 12, the upper support portion 21 and the lower support portion 22 as the support portions 20, and the fixing wall portion 30.

Even in the case of such a configuration, the effect following the effect obtained in the case of the sole 110 and the shoe 100 including the sole of the present embodiment described above can be obtained, and the case where the rigidity is higher than the surrounding area at the boundary portion between the insole 111 and the cushioning material 1D1' can be effectively suppressed, whereby a sole excellent in wearing feeling and a shoe including the sole can be produced.

< second modification >

Fig. 18 is a perspective view of a cushioning material included in the shoe sole of the second modification. Next, a cushioning material 1D1 ″ included in the shoe sole according to the second modification of the present embodiment will be described with reference to fig. 18. The cushioning material 1D1 ″ is disposed in the shoe sole 110 instead of the cushioning material 1D1 included in the shoe sole 110 of the present embodiment.

As shown in fig. 18, the cushioning material 1D1 ″ included in the shoe sole of the present modification is different from the cushioning material 1D1' included in the shoe sole of the first modification only in that the extension portion 50 is provided. Specifically, the extension portion 50 has a plate-like shape, and extends from the connecting portion between the lower support portion 22 and the fixing wall portion 30 so as to extend beyond the fixing wall portion 30 in the extending direction of the lower support portion 22.

The extension portion 50 is a portion for increasing the bonding area of the cushioning material 1D1 "to the insole 111 and the outsole 112, and by providing the extension portion 50, the cushioning material 1D1" is firmly bonded to the insole 111 and the outsole 112.

Therefore, in the case of such a configuration, the effect of following the effect obtained in the case of the sole 110 and the shoe 100 including the sole of the present embodiment described above can be obtained, and the case where the rigidity is higher than the surrounding area at the boundary portion between the insole 111 and the cushioning material 1D1 ″ can be effectively suppressed, whereby not only a sole having excellent wearing feeling and a shoe including the sole, but also a sole having excellent durability and a shoe including the sole can be obtained.

< summary of disclosure in embodiment and the like >)

The characteristic structures disclosed in the embodiments and examples and their modifications described above are summarized as follows.

A shoe sole according to an embodiment of the present disclosure includes: a bottom body provided with a ground contact surface, wherein a direction orthogonal to the ground contact surface is set as a thickness direction; and a buffer material assembled to the bottom body. The bottom body includes at least an insole, and the cushioning material is arranged so as to be aligned with the insole in a direction intersecting the thickness direction. The insole has a first facing surface that faces the cushioning material in a direction intersecting the thickness direction and is inclined with respect to the thickness direction, the cushioning material including: a buffer part having a three-dimensional shape formed by a wall whose outer shape is defined by a pair of parallel curved surfaces; and a plate-shaped fixing wall portion provided on a side where the first facing surface is located when viewed from the buffer portion, and having a second facing surface facing the first facing surface. The fixing wall portion is provided obliquely with respect to the thickness direction so that the second facing surface and the first facing surface are parallel to each other. In the sole according to the one embodiment of the present disclosure, the cushioning material is fixed to the insole by bonding the first facing surface and the second facing surface via an adhesive layer.

In the shoe sole according to the one embodiment of the present disclosure, the cushioning portion may include a plurality of three-dimensional structure portions obtained by changing a shape of a unit structure to which a thickness is given with reference to a unit structure of a triple-period extremely small curved surface, and in this case, each of the three-dimensional structure portions may be a shape obtained by changing a shape of the unit structure so as to follow a unit space shape, which is a regular hexahedral space occupied by the unit structure, to a trapezoidal space in a case where the unit space shape is changed to the trapezoidal space in an unloaded state. In this case, the plurality of three-dimensional structures may be arranged in a row along the fixing wall portion so that the inclined end portions of the plurality of three-dimensional structures are connected to the fixing wall portion.

In the shoe sole according to the embodiment of the present disclosure, the triple-period minimum curved surface may be a schwarz P.

In the sole according to the one embodiment of the present disclosure, the fixing wall portion may be provided with a plurality of through holes that connect an inner space of the cushioning material and a space surrounding the cushioning portion to the second opposing surface.

A sole according to another embodiment of the present disclosure includes: a bottom body provided with a ground contact surface, wherein a direction orthogonal to the ground contact surface is a thickness direction; and a buffer material assembled to the bottom body. The bottom body includes at least an insole, and the cushioning material is arranged to be aligned with the insole in a direction intersecting the thickness direction. The insole has a first facing surface facing the cushioning material in a direction intersecting the thickness direction, and the cushioning material includes: a buffer part having a three-dimensional shape formed by a wall whose outer shape is defined by a pair of parallel curved surfaces; and a plate-shaped fixing wall portion that is provided on a side where the first facing surface is located when viewed from the buffer portion, and that has a second facing surface that faces the first facing surface and is parallel to the first facing surface. The fixing wall portion is provided with a plurality of through holes that connect the internal space of the cushioning material and the space surrounding the cushioning portion to the second opposing surface. In the shoe sole according to another embodiment of the present disclosure, the first facing surface and the second facing surface are bonded via an adhesive layer, whereby the cushioning material is fixed to the insole.

In the shoe sole according to the one embodiment of the present disclosure or the shoe sole according to the another embodiment of the present disclosure, the cushioning material may be provided along a peripheral edge of the sole body.

A shoe according to an embodiment of the present disclosure includes: a sole according to one embodiment of the present disclosure or a sole according to another embodiment of the present disclosure; and the upper is arranged above the sole.

< other embodiments, etc. >

In the above-described embodiment and the modifications thereof, the case where the cushioning material is disposed along a part of the peripheral edge of the sole has been described as an example, but the position where the cushioning material is disposed is not limited thereto, and can be changed as appropriate. For example, the cushioning material may be disposed along the entire periphery of the sole, or the cushioning material may be disposed inward of the periphery of the sole. Further, the cushioning material may be disposed over the entire area of the sole. Further, depending on the type or application of the game in which the shoe is used, the cushioning material may be provided only in any one of the inner sole portion and the outer sole portion. Further, the cushioning material may be provided between the insole and the upper, and the cushioning material itself may also serve as the outsole. Here, when the cushioning material is provided on the entire surface of the sole, the entire sole may be replaced with the cushioning material instead of the insole.

In the above-described embodiment, the modification and the like, the case where the three-dimensional structure portion constituting the cushion portion is a unit structure to which a thickness is given with reference to the unit structure of the schwarz P structure, and the shape of the unit structure is changed has been described as an example, but the three-dimensional structure portion constituting the cushion portion may be a unit structure itself to which a thickness is given with reference to the unit structure of the schwarz P structure, a unit structure itself to which a thickness is given with reference to another unit structure of a triple extremely small curved surface such as a gyroid (gyroid) structure or a schwarz D structure, or a unit structure whose shape is changed.

In the above-described embodiment, the modification example, and the like, the case where the present invention is applied to a shoe including a tongue and a lace has been described as an example, but the present invention may be applied to a shoe not including these (for example, a shoe including a sock-shaped upper) and a sole provided in the shoe.

Further, the features disclosed in the above-described embodiments and modifications and the like may be combined with each other within a scope not departing from the gist of the present invention.

The embodiments of the present invention have been described, but the embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the appended claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims

1. A shoe sole, comprising:

a bottom body provided with a ground contact surface, wherein a direction orthogonal to the ground contact surface is set as a thickness direction; and

a buffer material assembled to the bottom body,

the bottom body at least comprises an inner bottom,

the cushioning material is arranged so as to be aligned with the insole in a direction intersecting the thickness direction,

the insole has a first facing surface that faces the cushioning material in a direction intersecting the thickness direction and is inclined with respect to the thickness direction,

the cushioning material includes: a buffer portion having a three-dimensional shape formed by a wall defining an outer shape by a pair of parallel curved surfaces; and a plate-like fixing wall portion provided on a side where the first facing surface is located when viewed from the buffer portion, and having a second facing surface facing the first facing surface,

the fixing wall portion is provided so as to be inclined with respect to the thickness direction such that the second facing surface is parallel to the first facing surface,

the first facing surface and the second facing surface are bonded via an adhesive layer, whereby the cushioning material is fixed to the insole.

2. The shoe sole of claim 1, wherein

The buffer portion includes a plurality of three-dimensional structural portions obtained by changing the shape of a unit structure having a thickness given thereto with reference to a unit structure of a triple-period extremely small curved surface,

the three-dimensional structure portions each have a shape in an unloaded state obtained by changing the shape of a unit space, which is a regular hexahedral space occupied by the unit structures, to a trapezoidal space, and changing the shape of the unit structures so as to follow the trapezoidal space,

the plurality of three-dimensional structures are arranged in a row along the fixing wall portion such that the inclined end portions of the three-dimensional structures are connected to the fixing wall portion.

3. The shoe sole of claim 2, wherein

The triple cycle minimum curved surface is Schwarz P.

4. The sole of any one of claims 1 to 3, wherein

The fixing wall portion is provided with a plurality of through holes that connect the internal space of the cushioning material and the space surrounding the cushioning portion to the second opposing surface.

5. A shoe sole, comprising:

a bottom body provided with a ground contact surface, wherein a direction orthogonal to the ground contact surface is a thickness direction; and

a buffer material assembled to the bottom body,

the bottom body at least comprises an inner bottom,

the insole has a first facing surface facing the cushioning material in a direction intersecting the thickness direction,

the cushioning material includes: a buffer portion having a three-dimensional shape formed by a wall defining an outer shape by a pair of parallel curved surfaces; and a plate-like fixing wall portion provided on a side where the first facing surface is located when viewed from the buffer portion, and having a second facing surface that faces the first facing surface and is parallel to the first facing surface,

a plurality of through holes are provided in the fixing wall portion, the plurality of through holes connecting the internal space of the cushioning material and the space surrounding the cushioning portion with the second facing surface,

6. The sole of any one of claims 1 to 5, wherein

The buffer material is arranged along the periphery of the bottom body.

7. An article of footwear, comprising:

the sole of any one of claims 1 to 6; and

and the upper is arranged above the sole.